41.   But that all changed after computer simulations were completed implying that the annoying VOCs were the key to controlling ozone in Chicago.

42.   But that is based on computer simulations and engineering calculations.

43.   But slowly it caught on, especially as computer simulations of that distant era of rocky creation showed that the collision idea was not crazy.

44.   But that has not satisfied foreign leaders and environmental campaigners who say computer simulations would offer much the same information.

45.   But they become more valuable when combined with specific performance data, which would then enable someone to generate a computer simulation of American warhead designs.

46.   But then computer simulations demonstrated that the system could not cover the westernmost islands in the Aleutians.

47.   But, if their paths are to cross, computer simulations now provide a preview of that celestial crash.

48.   Capt. Robert Meurn, left, of the U.S. Merchant Marine Academy created a computer simulation of the crash and uses it to instruct cadets at the academy.

49.   Cars stalled on flooded highways in computer simulations at the same time that real cars drowned in real flash floods.

50.   By running repeated computer simulations, he has worked out what would happen if a red-dwarf star were to pass through the solar system.